Replaceaele tooth for crusher rolls and other crushing elements



Dec. 19, 1933.

H. F. CAMPBELL REPLACEABLE TOOTH FOR CRUSHER ROLLS AND OTHER CRUSHING ELEMENTS Filed Sept. 26, 1930 Patented Dec. 19, 1933 UNIT-Ensures PATENT caries- My'inventio'm relates to'tlie-aiit of crushing and particularlytlo crusher rolls and other" crushing elements em lo ed iirtlie reduction of large rock: massapoafl and thelike.-

a s one obieet or my invention: ism provide an: improved form: of replaceable than; or iihpa'c'fi memberfor such crushing e'lementsycr iisheFrolls} mal the like; 2 suclrtonne occupying a preforrr'ied recess in the wall or body ofmaorushearoil or a; suitable seatin other forms of drilbliing elements; rtw illlbe miner stood that" a plurality as mesa-teeth Will be em loyed with a} crusher r011 ana mamney will be placed in reformed re c'essesf disposed thebody ofsu'cl'a roll.

at rurmer object of m invention: is to" rovide amrm 01 hollow tooth adapted t'o recesses ie a crusher roll} with means fol securing: sucli iioot-ll in place. I a 1 And ai still-'fui tlien object" of my invention is .:to provide such hollow tooth so employed with a crusher roll with a special form of recess which will serve as a tell-tale to indicate whenthe tooth is worn to its limit of usefulness and will serve the further, function of permitting or greatly :facilitating access by suitable burning means, an acetylene torch or the like, for the purpose of removing such worn tooth from its seat in order that a new tooth can be applied in place of the worn one and held in place in the same manner.

These and other features of my invention are more fully described hereinafter; reference being had to the accompanying drawing, in which:

Figure 1 is a fragmentary sectional view illustrating one formof a hollow replaceable tooth and holding means therefor within the scope of my invention; such tooth being shown in position in its support, a crushing roll in the present instance.

Fig. 2 is a plan view of the form of tooth shown Fig. 3 is a sectional view similar to Fig. 1 illustrating a tooth in worn condition, and

Fig. 4 is a sectional View of the tooth shown in Fig. 1, taken on the line IVIV.

The general shape of the tooth, the form of recess in the support receiving the same and the locking means therefor, is substantially like that illustrated in the'patent of E. H. Keiper, No. 1,865,860, July 5, 1932; a portion of the roll or supporting element being indicated at 1, and having a recess 2, with anundercut wall 2 for the reception of the tooth. The tooth, indicated at 3, disposed within such recess, comprises an impact portion 3 and front and rear walls 3 55 and 3; the front wall providing a toe portion wlllcll substantially fits the undercut wall 2 61 the reees's zz- I A 1 impao't members;- such as the teens ofi cfr ilsliel rb'll are subfiec't'e'd to erio'r niou's ar'id weaa- Emu re lacement bcblifs' necessaay 30 Have teen-warn tkfisuoh a be" min -effectivea'- ci-ulslilrig operation} in tlie" present instance- I prev-mea a Hollow todthf wltflfisilie's g such todtli liaving are internalspace or recess 4 which serves to liglitiah that pb'rtidn 61 the: tooth disposed witiiii-i the recess of its shppbr tithe dfiuslfer fen-for inmate-wea an; enacting" tlfe" sti eflgt tl of the impact portion t'li'ereofi- Additidiially, the siae recesseees we to fiiz thei lighter? the without-impairing to its saength attentiveness-i 'I he recessing of the tooth -ifi the' manner indicated provides-a pair on cementing walls which may" be in the format ribs? 3 between th froiit ancr rear walls 3 and 3 snowmmbremartieularlyin mg, These ribs may be recessed longitudinally of the tooth, as indicated at 3 so as to clear the bottom or floor of the recess 2; the walls 3 and 3 only contacting therewith.

As in the form of tooth shown in the Keiper application, securing means are provided which are preferably associated with the heel or rear wall 3 of the tooth; the rear surface of which may be substantially radially disposed with respect to the axis of the roll 1. At this point 185 provide a wedge 5 and key 6 between the wall 2 -of the recess and the wall 3 of the tooth; the key 6 lying between the wedge and the tooth and having a portion 6 underlying the heel of the tooth, which may be recessed at'3 for the purpose of receiving the same. After the tooth has been inserted in the recess 2, together with the key and wedge, and the toe portion of the front wall 3 has been jammed against the undercut wall 2 of the recess 2, the wedge 5 may be driven home between said key and the wall 2 of said recess 2 and then the upper portion 6 of the key is bent over on top of the wedge. The key is of such metal and construction as to retain the bent over condition during use. In the present instance the key is provided with an aperture 5 for the insertion of a removing tool and the roll may be recessed in line with said aperture, as at 1, for the ready application of such tool.

The improved teeth forming the subject of my invention are of such size that they may be considerably worn and still perform substantially the desired function. At the same time there is a limit to their usefulness and in order that such limit may readily be determined visually, I provide the internal hollow portion of the tooth with a supplemental recess 4 as clearly indicated in Figs. 1 and 3, which supplemental recess will be exposed when the tooth is worn to an extent as to be substantially useless; such extent being approximately indicated by the broken line :0, in Fig. 1. When the wear has continued to this point, the supplemental recess 4 is exposed and is a visual signal that the tooth is worn out and should be replaced.

Such tell-tale hole serves the further function of providing. ready access for a burning device, an acetylene torch for instance, the flame of which may be introduced through such opening and effect the complete burning out of the tooth and permit removal of the securing means; thereby clearing the recess 2 and making it ready for the reception of a new tooth. This arrangement is highly desirable because in practice the keying or securing means are liable to be completely hidden by the finer particles of the material being crushed which collect in the recesses and interstices between the same and the tooth combined with the natural rusting; thereby rendering the securing means difilcult if not impossible of removal until the tooth has been removed. The tell-tale, permitting access of the flame to burn the tooth, avoids the necessity of attempting to remove the wedge and/or key when they have rusted fast.

While I have-illustrated a single tooth set in recesses formed in the wall of a crusher roll or similar body, these teeth may be of any width (or length) desired and I may employ segments or blades extending the full length of a roll internallyrecessed in the same manner as the single tooth and provided with-supplemental recesses which serve as tell-tale indicia when such segments, blades or other members have been worn to such an extent as to, require renewal. In like manner such segments or blades may be held in place by means similar to that disclosed with reference to the securing means for a single tooth.

I claim: 7

1. A crushing element having a recess, an inserted tooth fitting said recess and'having an internal space or recess with a portion extending to a point beyond the surface of the recessed element receiving said tooth and adapted to be exposed when said tooth is worn, and means for securing said tooth within the recess of said crushing element.

2. A crusher roll having a recess, an inserted tooth fitting said recess and having an internal space or recess with a portion extending to a point above the periphery of said roll and adapted to be exposed when said tooth is worn, and means for securing said tooth within the recess of said crusher roll.

3. A crusher roll having a recess, a hollow tooth having front and back walls and connecting walls between the same defining an internal space fitting within said recess; vsaid tooth having a supplemental recess extending from the space between its ribs to a point above the periphery of said roll adapted to be exposed when said tooth is worn, and means for securing said tooth within the recess of said crusher roll.

4. A crusher roll having a recess, a hollow tooth fitting within said recess; said tooth having front and back walls and connecting ribs defining an internal space and a supplemental recess extending from the space between its ribs to a point above the periphery of said roll adapted to be exposed when said tooth is worn, and means for securing said tooth within the recess of said crusher roll.

HERBERT F. CAMPBELL. 

